my god, people, if you are going to use a site like that, don't use your real name, work email address, etc.
Well, you're making an assumption that people who use those sites are smart.
I mean, I see ads for Ashley Madison, a site that gears itself for having affairs. Since they're TV ads, I can't imagine the people who log into it looking to have an affair are too bright to not use their real names or anything. Especially since the information contained on that site would be particularly interesting to a lot of people (suspicious partners, for example).
As for those wanting people to pay so they can track them - I don't see the point. If the hackers were threatened with exposure, the best course of action is to release the entire list online. Sure it screws up future chances to make money, but those wanting to find them will suddenly get exposed (while the hackers take their money and run).